Press roll arrangement for papermaking machines



1947. L HORNBOSTEL ETAL 2,415,350

PRESS ROLL ARRANGEMENT FOR PAPER MAKING MACHINES Filed March 15, 1944 3Sheets-Sheet l fiver-1. :FE (40x0 flaemeosrzz. ow/:20 0. 6679019452.

1947- L. HORNBOSTEL ET AL 2,415,350

PRESS ROLL ARRANGEMENT FOR PAPER MAKING MACHINES Filed March 13, 1944 3Sheets-Sheet 2 Lam 0 HOEIVBOJ n51 Eon/4.90 D. BEAU/LE8- 1947- L.HORNBOSTEL ETAL 2,415,350

IRESS ROLL ARRANGEMENT FOR PAPER MAKING MACHINES Filed March 13, 1944 3Sheets-Sheet 3 HYEHZCIP E 11.0) floemsosrez. E0 wmeo 0. 547405158.

w ite-d 4 1947 v PRESS ROLL ARRANGEMENT FOR PAPER- MAKING MACHINES LloydHornbostel and Edward D. Beachler, Beloit, Wis., assignors to BeloitIron Works, Beloit, Wis., a corporation of Wisconsin Application March13, 1944, Serial No. 526,199

. 9 Claims. v 1

This invention relates to suction pick-oil roll assemblies and presssections for paper making machines.

Specifically the invention deals with paper makin machine presssectionswherein the paper web advancing through the press section from theforming section to the drier section never has the direction of travelchanged unless it is disposed between a pair of felts, or subjected tosuction. The press sections of this invention include cooperatingsuction transfer rolls and press rolls wherein one roll of a cooperatingpair receives the sheet and subjects it to low vacuum to hold it thereonfor conveying ,it to a transfer point, thereby eliminating any chancefor the sheet to fly oil the roll when traveling at high speed.

It has heretofore been necessary to use singed pick-up felts in driersections in order to keep the sheet on the felt especially as it passesthrough a top pick-off roll assembly in being transferred from theformingsection to the press section of the machine. Such singed pick-upfelts have also been necessary in suction presses since the felts areusually separated or divided after the first suction press. Now, thesinged type of pick-up felt is very heavy and resists water removal asit is quite dense, and air and water will not readily pass through it.

The present invention makes possible the use of very open, porous feltsfor conveying wet fibrous webs from their forming surfaces through thepress section to the drier section of a paper machine. In accordancewith this invention the paper web is never permitted to turn around aroll, and never has its direction of movement changed, unless it is heldon its carrier felt by means of vacuum or is between a pair of carrierfelts. The present invention simplifies felt runs in press roll sectionsfor paper making machines and especially Yankee-type paper makingmachines,

A feature of the invention involves the elimination of the heretoforeencountered problem of havin the sheet stick to the wrong felt afterleaving a suction press. In accordance with this invention, a feltconveying the web to a suction press has the web covered with acooperating felt in advance of the press, and suction in advance of thenip of the press transfers the web from the carrying felt to thecovering felt. Then, as the pair of felts with the web therebetween passthrough the nip of the press, the web is retransferred back to the firstfelt and held thereon by suction applied through. the first felt afterthe nip area. This eliminates the heretofore encountered dimculties inhaving the web stick to the covering 2 felt. As a result of this featureof the invention, press sections can be operated more efficiently and athigher pressures.

A further feature of the invention is the provision of transfer rollassemblies with high vacuum and-low vacuum areas wherein the low vacuumareas will hold the sheet on a roll feeding it to a transfer point andwill remove some water from the sheet while so holding it, and whereinthe high vacuum areas will dry the sheet, and hold water in the holes ofthe roll until the sheet is removed out of the path of water dischargedfrom said holes.

An object of the invention is therefore to provide press sections forpaper making machines capable of handling paper at high speedswithoutthe use of singed pick-up felts to convey the paper.

Another object of the invention is the provision of paper machine presssections with felt runs and suction rolls so arranged that the directionof the paper is not changed through its entire passage between theforming section and the drier section of the machine unless the paper isdisposed between a pair of felts, or is held on a felt by suctionapplied through the felt.

A still further object of the invention is to eliminate the possibilityof separation of a web of paper from the carrier felt as the felt andpaper turn around a roll by subjectin the paper to vacuum during theentire time it is changing direction of travel.

A still further object of the invention is to provide a transfer rollassembly having a, suction couch roll cooperating with a suctiontransfer roll and a final couch roll or turning roll for directing theforming wire off of the couch roll at the nip between the couch roll andtransfer roll.

A still further object of the invention is to provide a press sectionfor a Yankee-type Fourdrinier paper making machine wherein suctiontransfer rolls and suction press rolls cooperate with open readilydrained felts to convey the paper through the section withoutencountering undesired separation of the paper from the felt,irrespective of the speed of operation.

A still further object of the invention is to provide a Yankee-typeFourdrinier paper making machine with a drier section including a,predrier drum in advance of the main drier drum and suction rollscooperating with felts to continuously support the paper web from theforming section to the main drier drum.

Other and further objects of the invention will be apparent'to thoseskilled in the art from the following detailed description of theannexed 3 sheets of drawings which, by way of preferred examples only,illustrate two embodiments of the invention.

n the drawings:

Figure 1 is a fragmentary somewhat diagrammatic side elevational view ofthe press and drier sections of a Yankee type Fourdrinier paper makingmachine embodying transfer and press roll assemblies and felt runs inaccordance with this invention.

Figure 2 is an enlarged side elevational view, with parts broken awayand shown in vertical cross section, of the transfer roll assembly ofFigure a Figure 3 is an enlarged fragmentary side elevational view, withparts broken away and shown in vertical cross section, of anothertransfer roll assembly of Figure 1. I

Figure 4 is a somewhat diagrammatic side elevational view of a press anddrier section of a Yankee-type Fourdrinier paper making machine equippedwith transfer rolls, suction presses, and felt runs in accordance with amodified embodiment of the invention.

As shown on the drawings:

In Figure l the reference characters F designate a floor section of apaper mill supported on columns 0 above a basement floor, for example,and carrying posts P supporting overhead beams such as B.

Supports for a transfer roll assembly ID, a first horizontal press rollassembly Hi, a second vertical press roll assembly l2, a predrier drumassembly, l3, a stripper roll assembly l4, a second transfer rollassembly l5, and the first drier drum l5 of a drier section are carriedon the floor F. A support for the Yankee drier drum i1 is mounted on thebeams such as B.

As shown in Figures 1 and 2, the transfer roll assembly Ill includes asuction couch roll l8 and a plain couch or turning roll I9 within theloop of the paper machine forming wire together with a suction transferroll 2| and a plain guide roll 22 within the loop of a pick-up felt 23.

The suction transfer roll 2| mounted on the floor F as at 24 and apressureapplying jack 25 coacting with the adjacent post P maintains thetransfer roll in cooperating relation with the couch roll to define atransfer nip N therebetween.

The forming wire 20 is wrapped around the top of the suction couch rolll3 and travels downwardly under the plain couch roll or turning roll l9to convey the web of paper W thereon through the nip N of the assemblyonto the pick-up felt 23 which is guided into the nip N by a guide roll26 positioned outside the loop thereof and which is guided out of thenip by the roll 22 inside of the loop thereof.

The suction couch roll l8 has a suction gland or box 21 therein withpacking strips 28. 29, and proiecting therefrom into sealing relationwith the perforated shell 32 of the roll. The shell 32, of course, isrotatable around the stationary suction box 21, and the packing strips28 and 29 are positioned to extend around the downturning side of theroll to define a suction area a serving to hold t e wire 20 and web Wtightly against the shell 32 even though the wire and web are travelingat high speed. A butterfly-type valve 33 controls the extent ofcommunication between the suction area a and the interior of the suctionbox 21 so as to regulate the degree of suction in t e area a. Thissuction area a is generally maintained under a relatively low vacuum andis pivotally 4 its function is to hold the sheet W on the roll and toremove some water from the sheet. The spaced packing strips 29 and 30define a suction area b in full communication with the interior of thesuction box 21, and this suction area extends from the area a into thenip N. The function of the suction area b is to remove water from thewith W and to prevent the water in the holes of the shell 32 from beingdischarged back through the wire into the web.

The transferroll 2| has a stationary suction box or gland 34 thereinwith a perforatedmetal shell 35 rotatable therearound and covered with asimilarly perforated rubber cover 36. The suc tion box has spacedpacking strips 31 and 38 defining therebetween a suction area 0 in fullcommunication with the interior of the suction box 34 and extending fromthe nip N into spaced relation beneath the nip.

The turning roll or plain couch roll i9 wraps the forming wire 2|!partially around the transfer roll 2| to guide the wire oil of the rolll8 at the point where the holes in the roll shell 32 are passing overthe packing strip 30 so that the wire and web W thereon is out of thepath of streams of water S discharged from holes in the shell when thevacuum in the holes is released. It will be noted from Figure 2 that nipN terminates at the packing strip 30 so that the wire is not removedfrom the shell 32 when the holes in the shell are in communication withthe suction area b. As a result of this arrangement high vacuum can bemaintained in the suction area b. The streams of water S are collectedin a pan or trough 39 surrounding the roll l8.

The pick-up felt 23 is wrapped around the rubber cover 36 of thetransfer roll 2| and covers the suction area 0 to receive the web W fromthe wire 20 as the web passes through the nip. It will be noted that thesuction area c extends for a distance beneath the nip to subject thepick-up felt and web to suction for insuring complete transfer of theweb off of the wire onto the pickup felt as well as to prevent the webfrom flying outwardly back toward the wire. The pick-up felt with theweb thereon passes tangentially off of the roll and travels in astraight path to the guide roll 22. A guide roll '40 adjacent the roll22 directs a bottom felt 4| against the web W on the pick-up felt 23before the web and felt turn under the roll 22. Therefore as soon as thedirection of travel of the web W is changed, the web is covered by thefelt 4| and cannot fly off of the felt 23.

As shown in Figure l, the web W between the pick-up felt 23 and coveringfelt 4| passes from the roll 22 to the first horizontal suction pressassembly around the top of the suction roll 42 thereof. thencedownwardly throu h the nin between this roll 42 and the cooperating roll43.

The roll 42 has a first low vacuum suction area 42;; extending from thetop thereof to a high vacuum area 42b extending through the nip of 5 therolls. A valve 420 is provided to regula e the vacuum in the area 42a ascom ared with the high vacuum in the area 42b. The roll 43 .has asuction areav 43a, in the nip and a low vacuum suction area 43bextending around the bottom part of the roll from the area 43a andhaving the vacuum therein controlled by a valve 43c.

As the web between the felts 23 and 4| passes through the nip of thehorizontal press, it is subjected to vacuum from both high suction areas42b and 43a so that water will be sucked through 5 a both felts out ofboth faces of the web. The felt 4| is separated from the web afterpassage v wringer rolls 4! back to the roll 48.

The transfer roll 2|, like the couch roll I8, is equipped with a trough'48 collecting streams of water S spewing from the holes in the rubbercover 38 and shell 85 after vacuum in the holes is released. but it willbe noted that the roll 22 guides the web and felt out of the path ofthese streams S.

I The roll 42 of the press ll likewise has a trough 4'I collecting waterfrom the holes in the roll shell. A collecting pan or trough 48 isprovided for the rou43 of this press.

The felt 28 with the web W is covered with a second bottom felt 48 assoon as it leaves the suction area 431; of the roll 44 and passesbetween the felts 28 and 48 through the nip of the vertical pressbetween the rolls 88 and El ofthis press. The roll 88 isasuction rolland has a high vacuum suction area 884: at the nip together with a lowervacuum-suction area 50b controlled by a valve Etc-extending fromthevacuum area 58a around the top turning portion of the roll. The rolljack 52 suspended desired amount of pressure against the roll- 50. Theweb w is transferred oil' of the'pick-up felt 23 as it, passes throughthenip of the vertical press and suction in the suction areas 80a and-58b holds the web on felt-48. The felt-28 passes upwardly around the toproll II over a guide roll 53 and thence under a guide roll 54 andupwardly between wringer rolls I58. A- shield 881s provided to define atrough under the roll 54 so that water squeezed out of the felt by thewringers 58 will not rewet the felt or web. The felt next travels over aguide roll 58, thence arounda guide roll 51 to a tension roll 58 andnext from the tension r03 5: around a guide roll 88 back to thedirecting r 2 The felt 49 conveys the web around the roll 50 to thepredrier l8 and contacts the web with the drum 6|) of this predrier. Thefelt'causes the web to be held in tight engagement around the peripheryofthe drum where it will be dried by the heat of the drum. The felt 48is then trained around the roll 8| of the stripper M. This r011 6| has ahigh vacuum suction area 6|a extracting water from the web and pullingthe web off of the drum 80 to cause it to hug the felt 49. A low vacuumsuction area 6|b controlled by a valve tlc is provided to cause the webto remain on the felt as it passes around the roll 6|. These high andlow vacuum areas may be constructed in a manner similar to that shown inFigs. 2 and 3. A covering felt 82 is directed over the roll 8| to coverthe web thereon by means of a directing roll 88. The web passes betweenthe felts 49 and 62 to the under side of the roll 84 of the transfer l8.This roll 84 as best shown in Figure 3, includes a perforatedrotatable'metal can be a plain or rubbercovered roll, and-is carried ona pivotal support Sla from the adjacent post 1? and isurged by from thebeam -B with a felt 48 is separated from the web W and the web istransferred onto the covering felt 62 by the suction area d. A guideroll 69 directs the felt 48 away from the roll 64 and the felt thenpasses over guide rolls 18 to a tension roll H and around rolls I2 backto the roll 18 which directs it into recontact with another portion ofthe web at the suction'roll 48.

The suction area e of the roll 84 holds the web JV on the felt 62 as ittravels around the roll,

, and the suction area of this roll extracts an additional amount ofwater from the web in advance of the nip provided by theroll and thedrum 14 0f the cooperating Yankee H. The nip is at the terminal end ofthe suction area I so the web is transferred to the drum I4. Any waterreleased from holes in the shell 65 and its rubber cover 66 is caught ina trough l5. The felt 62 passes over the top of the .roll 84' and undera guide roll 16 having a shield 'II 'therearound.

The felt then passes upwardly between wringer rolls 18, and any watersqueezed out of the felt will be collected in the shield 11. This shieldcan cooperate with the trough It to discharge its water into the trough;Guide rolls I8 and ten sion roll 80 guide the felt back to the directinroll 68 over the top of the stripper roll 6|.

shell 65 covered with a similarly perforated rubarea e is controlled bymeans of a valve .88. T110" on the drum 88.

The paper is conveyed around the drum l4 and is removed from the drum bymeans of a doctor 8| Rolls 82 then guide the paper, which may be creped,to the first drier 88 of the drier section IS. A felt 84 can be providedto hold the paper It will be noted that the entire passage of the paperfrom the forming .wire 20 to the Yankee drier 14 is accomplished withoutchangingthe direction of travel of the paper unless it is held on a feltby means of suction, or disposed between two felts. This prevents anpossible separation of the paper from a carrier felt and the section canbe run at very high speed without injury to even a very light weightdelicate web such as tissue.

A jack 85 is provided on the floor F cooperating with a pivoted trunnionlever 86 which is pivoted on a post P as shown to support the roll 84 ofthe transfer device It. The jack 85 can be operated so that the transferroll 64 will have the desired nip pressure with the Yankee drum I4.

In the embodiment shown in Figure 4, parts identical with partsdescribed in Figures 1 to 3 have been marked with the same referencenumeral. It will be noted from Figure 4 that the couch roll l8 does nothave nip pressure with the cooperating transfer roll 2| since it isspaced from the transfer roll but the turning roll l9 guides the formingwire 20 so as to wrap the transfer roll 2| over the suction area 0thereof. The suction area 0 can then transfer the web from the wire 20to the pick-up felt 23. This pick-up felt cooperates with the bottomfelt 4| as described hereinabove to convey the web between felts to afirst press |2 which has vertical press rolls 50 and BI with a suctionarea 58a in the roll 50. The felt 4| and the top felt 23 then convey theweb from this first press l2 directly to the transfer assembly |8 wherethe web is transferred to In this arrangement the ure 4, like thearrangement of Figure 1, does not permit the direction of travel of theweb to 7 change from the time it leaves the forming wire 20 until itreaches the drum of the Yankee drier Il unless the web is either held ona felt by suction, or disposed between two felts.

The suction transfer assemblies and press rolls of this invention havingthe low vacuum suction areas cooperating with high vacuum suction areasmake possible the holding of an uncovered web on a felt as it passesaround a roll even at .the highest speeds without permitting the web toleave the felt and without necessity for slowin up the assembly- Thearrangement also makes possible the useof lighter, more open, and lessdense felts in place of the heretofore necessary singed pick-up felts.The open felts are readily drained and suction capacity for pullingwater and air through them is much less than when the denser singedfelts-are used. As a result, the low vacuum areas which hold the web onthe felt and effect a better transfer than the heretofore used singedpick-up felts, do not increase the suction requirements above thoserequirements heretofore necessary with the singed felts.

under the influence of vacuum whenever it would have a tendency to leavethe felt.

2. In a paper making machine, a looped forming wire having an upper run,a couch roll in the loop of the wire at the end of said run, a turningroll in the loop of the wire below the couch roll receiving the wirefrom the couch roll, a looped pick-up felt, a transfer roll in the loopof said It will, of course, be understood that various details ofconstruction may be varied through a wide range without departing fromthe principles of this invention and it is, therefore, not the purposeto limit the patent granted hereon otherwise than necessitated by thescope of the appended claims.

We claim as our invention:

1. In a paper making machine, a looped forming wire having an upper run,a, couch roll in the loop of the wire at the end of said run, a turningroll in the loop of the wire below said couch roll receiving the wirefrom the couch roll, a looped pick-up felt, a transfer roll in the loopof said pick-up felt projecting into the run of the forming wire betweenthe couch roll and turning roll for wrapping the pick-up felt, theforming wire, and any web on the forming wire around a portion of thetransfer roll, said couch roll having a low vacuum area extending aroundthat portion of the roll covered by the wire as it turns from itshorizontal run to travel toward the turning roll together with a highvacuum area following the low vacuum area, said turning roll separatingthe forming wire from the couch roll as the wire leaves the high vacuumarea of the couch roll, said transfer roll having a vacuum area in theportion thereof covered by the pickup felt and wire effective totransfer the web to the pick-up felt afterthe web has passed the highvacuum area of the couch roll, a. directing roll in the loop of thepick-up felt receiving the felt from the transfer roll around the underside thereof and providing a straight; run of felts between the transferroll and thedirecting roll, a bottom felt covering the web on thepick-up felt before its straight run direction is changed andcooperating with the pick-up felt to convey the web therebetween, asuction press receiving the felts and web therethrougli, a seconddirecting roll separating the felts and uncovering the web, a drierdrum, a suction roll adjacent the drier drum receiving the uncovered webtherearound, and said suction roll having a pair of spaced high vacuumareas positioned to act on the web as it comes onto the roll and as itleaves the roll to felt, a directing roll in the loop of said felt belowthe transfer roll, said transfer roll receiving a portion of the formingwire and an web thereon therearound in the run of the wire between thecouch roll and the turning roll, said directing roll separating thepick-up felt from the wire, said couch roll having a vacuum area thereinholding the web on the forming wire as it travels around the roll andalso having a second vacuum area following said first mentioned area toextract water through the wire from the web, said transfer roll having asuction area receiving the web from the last mentioned suction area ofthe couch roll to transfer the web to the pick-up felt, a covering felttrained around the directing roll inthe loop of the pick-up felt forcovering the web thereon at the end of said straight run of said felt, ahorizontal suction press having roll receiving the felts with the 'webtherebetween therearound, said roll having a low vacuum suction areacausing the felts and web to closely hug the roll, said suction presshaving a suction nip with opposed vacuum areas for drawing water throughboth felts from the web, a roll separating said bottom felt from saidweb, the second roll of the horizontal press having a low vacuum areatherein holding the uncovered web-on the pickup felt as it travels underthe roll, a second covering felt, a vertical suction press receiving thesecond covering felt and pick-up felt with the web between the feltsfrom the second roll of the horizontal press, the top roll of saidvertical press receiving the pick-up felt therearound, said bottom rollof the vertical press having a suction area in the nip of the press anda second suction area beyond said nip holding the web on the secondcovering felt as it passes around the roll, a drier drum receiving theweb on the second covering felt from said bottom roll of the verticalpress, a stripper roll adjacent the drier drum having a suction area forholding the web on the covering felt as it passes around the stripperroll, a top felt cooperating with the stripper roll to cover the web on,the second bottom felt, a transfer roll in the loop of said top felthaving a first suction area for transferring the web from the secondbottom felt to the top felt together with a second vacuum area holdingthe web on the top felt as it travels around the roll, and a drier drumreceiving the web from said roll, said web in its entire travel fromsaid forming wire to said last mentioned drier drum being held under theinfluence of vacuum or disposed between felts whenever it would have atendency to leave the elt.

3. In a paper making machine, a looped forming wire having an upper run,a couch roll in the loop of the wire at the end of said run, a tumingroll in the loop of the wire below the couch roll receiving the wirefrom the couch roll, a looped pick-up felt, a. transfer roll in the loopof the felt, a directing roll in the loop of the felt, said transferroll and directing roll holding the pick-up felt against the formingwire and any web thereon in the run of the wire between the couch rolland the turning roll, said couch roll having a vacuum area holding theweb on the operate with the pick-up felt for conveying the webtherebetween, a suction press receiving the felts with the webtherebetween, a second transfer roll in the loop of the pick-up feltreceiving the felts and web from the suction press, a second roll in theloop of the bottom felt separating the bottom felt from the web saidsecond transfer roll having a suction area for/transferring the web tothe pick-up felt and holding the web on the pick-up felt as it travelsaround the roll, and a drier drum cooperating with the second transferroll to receive the web therefrom, said web: in

its entire travel from the upper run of the forming wire to the drierdrum being under the influence of vacuum or between felts whenever itwould have a tendency to leave the felt.

4. In a paper making machine including a looped forming wire and a drierdrum in spaced relation therefrom, a suction press section between theforming wire and the drier drum including a looped relatively openlightweight pickup felt, a suction transfer roll in the loop of the feltpicking up the web from the forming wire, a pair of rolls arranged forextending between them the wire while carrying the web to .wrap itpartially around the suction area of said transfer roll, a bottomcovering felt cooperating with the pick-up felt to cover the web, thesuction press receiving therethrough the felts with the webtherebetween, a roll in the loop of the covering felts separating saidfelts to uncover the web, one of the rolls of said suction press havinga vacuum area holding the pick-up felt and uncovered web thereon on theroll asit travels therearound, a second bottom felt covering the web onthe pick-up felt as it leaves the suction press, a second suction pressreceiving therethrough the felts with the web therebetween, said pick-upfelt following one of the rolls of said second suction press and saidsecond covering felt following the other of the rolls of said suctionpress, said other roll having a vacuum area holding the web on thesecond bottom felt, and a drier drum receiving the web from said otherroll of the second suction press, said web in its entire travel from theforming wire to the drier drum being under the influence of vacuum ordisposed between felts whenever its direction of travel is changing, orwhenever it tends to leave the felt.

5.'A suction transfer roll assembly comprising a suction couch roll, aforming wire trained around the couch roll, a turning roll receiving theforming wire therearound from the couch roll, said couch roll having alow vacuum area for holding a web of paper on the forming wire as ittravels around the couch roll, said couch roll also having a high vacuumarea adjacent the lowvacuum area to extract water from the web, acooperating suction transfer roll, said turning roll separating saidwire from said couch roll at the end of said high vacuum area, a pick-upfelt trained around said cooperating suction roll, a directing rollwithin the loop of the Pick-up felt, said directing roll cooperatingwith said turning roll to separate the pick-up felt and the formingwire, and said suction transfer roll having a suction area covered bysaid pick-up felt for transeferring the web from-the wire to the pickupfelt. 1

6. A suction transfer roll assembly comprising a pair of cooperatingsuction rolls, a forming wire 5: and means trainingv said wire aroundone of said suction rolls with its web carrying surface facing outwardlyand thereafter partially wrapping the wire around the other roll-withits web carrying surface; facing said other roll following the nip ofsaid rolls, a pick-up felt trained around said other of said suctionrolls, the first said suction roll receiving the forming wiretherearound having a low vacuum suction area to hold the web onthe -wireas it travels around the roll and having a smaller high vacuum suctionarea immediately following. the low vacuum area to extract water fromthe web on the wire, said other suction roll receiving the pick-up felttherearound projecting into the path of the forming wire and web as itleaves the high vacuum area of .said first roll, and a vacuum areainsaid, second roll following the nip of the rollers acting through thepick-up felt to drawthe web-from the wire onto the pick-up felt,

'7. In a paper making machine, a looped forming wire, a suction couchroll within the loop of the wire, a turning roll within the loop of thewire, said couch roll receiving the wire thereover and said turning rollreceiving the wire thereunder -from'said couch roll, a stationarysuction box in said couch roll having a first suction area ofappreciable width holding a web on the forming wire as it turns aroundthe roll together with a second and narrower suction area immediatelyfollowing said first suctionarea, a valve cooperating with said suctionbox to maintain the first suction area at lower vacuum than the secondsuction area, said turning roll directing the wire oil of said shellafter the holes in the shell have passed beyond the second suction areabut before the said holes have had the vacuum therein released, and acollecting device interposed between the couch roll and the turning rollreceiving water spewed from the holes in the shell of 45 the couch rollwhen the vacuum is released.

8. In combination, first and second suction rolls defining a niptherebetween, a forming wire trained around said first-suction rollthrough said nip, means for wrapping said forming wire par- 50 tiallyaround said second suction roll beyond the nip, a felt for covering thepaper web on said wire as it passes through said'nip, means guiding saidfelt to lap it around said suction roll beyond said nip, a suction boxin said first suction roll 65 positioned to impose suction on the firstroll preceding the nip and slightly beyond the nip, and

a suction box in said second roll positioned to suck water through thefelt beyond the. nip for effecting transfer of the paper sheet from them wire to the felt.

9. In combination, first and second suction rolls defining a niptherebetween, a forming wire trained around said first suction rollthrough said nip, means for wrapping said forming wire par- 65 tiallyaround said second suction roll beyond the nip, a felt for covering thepaper web on said wire as it passes through said nip, means guiding saidfelt to lap it aroundsaid suction roll beyond said nip, a suction box insaid first suc- 70 tion roll having an offgoing seal so arrangedrelative to said nip that water sucked into the holes of the firstsuction roll will be thrown clear of the wire on the leaving side of thehip, and a suction box in said second roll positioned to suck 75 waterthrough the felt beyond the nip for effecting transfer of the papersheet from the wire Number to the felt. 2,088,817 LLOYD HORNBOS TEL.2,340,108 EDWARD D. BEACHLER. 2,174,744 4. 5 2,209,760 REFERENCES CITED2,204,42 The following references are of record in the 2,144,770 file ofthis patent: 118581546 UNITED STATES PATENTS 10 Number Name Date Number2,338,465 Street Jan. 4, 1944 499357 1,701,226 Collins Feb. 5, 19298,636

Name Date Berry June 15, 1937 Berry Jan. 25, 1944 Hill Oct. 3, 1939Berry July 30, 1940 Millspaugh June 11, 1940 Millspaugh Jan'. 24, 1939Farnsworth May 17, 1932 FOREIGN PATENTS Country Date 9 British Jan. 26,1939 British 0t 1911

